Standards

IEC 61158 and IEC 61784

These documents show that the WorldFIP protocol is part of European
fieldbus standard EN50170. However, it turns out that the standards
series EN 50170 has been replaced by the 61158 series ("Industrial
communication networks. Fieldbus specifications"), in particular:

EN 50170

MICROFIP HANDLER Software User Reference Manual

The detailed contents of the so-called MPS variables is not defined in
any of the above standards. I have not been able to find any other
description than in the MICROFIP HANDLER Software Version 4 User
Reference Manual.

1.3.4.1 A definition of Promptness, Refreshment and a bit
that's not in the IEC specifications called Significance
(meaning: the variable has been written at least once) is given.

1.3.4.2 Format of Variables produced on network (but this is for
so-called dynamic variables, but the STATUS byte is the same
(bit 0=refreshment, bit 2=significance, other bits may be
anything).

1.5 Detailed description of the variables Report, List of
equipment present, Presence, Identification, Time and others.
However, the Identification variable described has not the same
PDU type and format as described in the MicroFIP manual.

9 Medium dependent sublayer (MDS) (page 120-123, defines coding,
preamble, start/end of frame delimiters). Strangely enough Table
257 of IEC-61784 specifically states that this clause is not
included in the profile 5/1 WorldFIP, but it corresponds to "The
WorldFIP protocol" brief).

11.6 Jabber inhibit - describes the MAU should self-inhibit in
case of too long transmissions (and reset after 0.5 to 3
seconds). If implemented in FielDrive, it may mean that it can
inhibit itself if this logic is sensitive to radiation.

WorldFIP usage at CERN

At CERN over 450km of WorldFIP cables is installed, serving a total of
about 12000 nodes. All of this is required for the lifetime of the LHC
operation timescale of 15-20 years.
WorldFIP is used in eight principle systems of the CERN accelerator
complex: